Chrome started rolling out update 69 at the beginning of this month (September 2018) causing a missing www in the address bar. There are two things this update did that you need to be aware of.
I typically love a lot of the Google projects and updates they do, but the missing www in the address bar left me a little puzzled and why they thought they needed to do it. On the plus side, I do like the new chrome tabs, so the entire update is not all bad. Also, the changes to default to secure sites has been a long time coming. There are many different reasons for this, but the fact is by forcing webmasters to use SSL and get secure is a good thing. These days non-secure http sites can easily be exploited by a variety of different methods and this is a welcomed change in my opinion.